Activity: Improve PHPDoc formatting for BP_Activity_Activity::get().

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9254 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Activity: Improve PHPDoc formatting for bp_has_activities().

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9255 cdf35c40-ae34-48e0-9cc9-0c9da1808c22